Flutter推送通知仅在应用程序处于后台时工作

Question

Flutter推送通知仅在应用程序处于后台时工作

node.jsflutterpush-notificationfirebase-cloud-messaging

10

我的问题涉及使用Flutter和firebase_messaging插件进行推送通知。

问题：

我已将firebase_messaging插件集成到我的Flutter应用程序中以进行推送通知。我可以保证，就我所知，设置是正确的，因为我正在接收推送通知。问题出现在仅当我的应用程序在后台运行（如最小化但仍在系统内存中）时才会接收到推送。当应用程序在前台或被杀死时，将无法接收到推送。

为了提供我尝试过的解决方案，我无法弄清楚实际上需要做什么。

我已经按照教程进行了操作，并采取了每一步来克服问题，但都没有成功。

我正在使用NodeJS处理firebase-admin和serviceaccountkey文件，因为我需要从我的数据库中获取device_tokens。

 const firebase = require('firebase-admin');
 const serviceAccount = require('../controller/firebase/serviceAccountKey.json');
 firebase.initializeApp({
  credential: firebase.credential.cert(serviceAccount)
 });

 //Function to actually implement the push
 const pushNotificationInitiatorSubscription = (resultValue) => {
 let devicesTokenString = resultValue[0]['device_token'];
 const firebaseToken = devicesTokenString;
 const payLoad = {
   notification: {
   title: 'New Subscription',
   body: 'You have a new subscription to your material ' + resultValue[0]['course_name']
 }
};
const option = {
 priority: 'high'
};

firebase.messaging().sendToDevice(firebaseToken, payLoad, option).then(success => {
  // console.log(success.results[0]['error']);
  // console.log(success.results[1]['error']);
  // console.log(success);
}).catch(err => {
 console.log(err);
})

Flutter

import 'package:firebase_messaging/firebase_messaging.dart';

class FirebaseCloudMessage {
 static FirebaseCloudMessage _instance = new FirebaseCloudMessage.internal();
 FirebaseCloudMessage.internal();
 factory FirebaseCloudMessage() => _instance;

 final FirebaseMessaging _firebaseMessaging = new FirebaseMessaging();

 configureFirebaseListeners() {
  print('Here');
  _firebaseMessaging.configure(
    onMessage: (Map<String, dynamic> message) async {
  print("Message $message");
  // return message;
}, onLaunch: (Map<String, dynamic> message) async {
  print("Message $message");
  // return message;
}, onResume: (Map<String, dynamic> message) async {
  print("Message $message");
  // return message;
});
}
}

需要帮助。谢谢

- Subhajit Syam Choudhury

1个回答

网页内容由stack overflow 提供, 点击上面的

可以查看英文原文，
原文链接

- Abhishek Diwakar · Accepted Answer

这是目前从Firebase通知服务接收到的通知的默认行为。如果您想在应用程序在前台运行时显示通知，您需要手动编写代码。

以下是使用flutter_local_notifications包在Flutter中显示通知的演示。

注意：这只是使用flutter_local_notification包在Flutter中显示通知的非常基本的例子。您可以进行很多配置。有关详细说明，请访问此包的主页或阅读这篇非常好的medium文章。

步骤1：在pubspec.yaml中安装flutter_local_notifications包。

步骤2：在initState()中初始化FlutterLocalNotifications：

@override
  void initState() {
    super.initState();

    var initializationSettingsAndroid =
        new AndroidInitializationSettings('@mipmap/ic_launcher');
    var initializationSettingsIOS = new IOSInitializationSettings();
    var initializationSettings = new InitializationSettings(
        initializationSettingsAndroid, initializationSettingsIOS);

    flutterLocalNotificationsPlugin = new FlutterLocalNotificationsPlugin();
    flutterLocalNotificationsPlugin.initialize(initializationSettings,
        onSelectNotification: onSelectNotification);
  }

第三步: 创建一个函数来处理通知的点击事件。当用户点击通知时，将调用此函数。

Future<dynamic> onSelectNotification(String payload) async {
    /*Do whatever you want to do on notification click. In this case, I'll show an alert dialog*/
    showDialog(
      context: context,
      builder: (_) => AlertDialog(
        title: Text(payload),
        content: Text("Payload: $payload"),
      ),
    );
  }

第四步：编写一个函数来显示通知：

Future<void> _showNotification(
    int notificationId,
    String notificationTitle,
    String notificationContent,
    String payload, {
    String channelId = '1234',
    String channelTitle = 'Android Channel',
    String channelDescription = 'Default Android Channel for notifications',
    Priority notificationPriority = Priority.High,
    Importance notificationImportance = Importance.Max,
  }) async {
    var androidPlatformChannelSpecifics = new AndroidNotificationDetails(
      channelId,
      channelTitle,
      channelDescription,
      playSound: false,
      importance: notificationImportance,
      priority: notificationPriority,
    );
    var iOSPlatformChannelSpecifics =
        new IOSNotificationDetails(presentSound: false);
    var platformChannelSpecifics = new NotificationDetails(
        androidPlatformChannelSpecifics, iOSPlatformChannelSpecifics);
    await flutterLocalNotificationsPlugin.show(
      notificationId,
      notificationTitle,
      notificationContent,
      platformChannelSpecifics,
      payload: payload,
    );
  }

第五步：调用_showNotification()函数：

_firebaseMessaging.configure(
    onMessage: (Map<String, dynamic> message) async {
        //print("Message $message");
        _showNotification(1234, "GET title FROM message OBJECT", "GET description FROM message OBJECT", "GET PAYLOAD FROM message OBJECT");
        return;
    }
}

完成后，即使您的应用在前台运行，也可以显示通知。希望这会有所帮助。